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DefaultTraceListener.Fail Method (String, String)

Emits or displays detailed messages and a stack trace for an assertion that always fails.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

public override void Fail(
	string message,
	string detailMessage


Type: System.String

The message to emit or display.

Type: System.String

The detailed message to emit or display.

By default, this method sends the message parameter, the detailMessage parameter, and a stack trace to a message box (when the application runs in user-interface mode) and to the DefaultTraceListener instance.

The following code example calls a function that calls the Fail(String, String) method to log a detailed error message if the function throws an exception. The method writes the message to the console if a user interface is not available.

// Compute the next binomial coefficient and handle all exceptions. 
    result = CalcBinomial(possibilities, iter);
catch(Exception ex)
    string failMessage = String.Format("An exception was raised when " +
        "calculating Binomial( {0}, {1} ).", possibilities, iter);
    defaultListener.Fail(failMessage, ex.Message);
    if (!defaultListener.AssertUiEnabled)
        Console.WriteLine(failMessage+ "\n" +ex.Message);

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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